ABSTRACT
The response of a unidirectional titanium matrix composite to a biaxial stress state at room and elevated temperatures is predicted using finite element analysis. The effect of residual stresses associated with processing are explicitly included. As the applied loads increase, the material state evolves due primarily to matrix viscoplasticity and fiber-matrix debonding. Once the state has sufficiently evolved, fiber breakage and/or matrix cracking can lead to fracture of the material. The effect of microstructural architecture is demonstrated by using different repeating unit cells. Of the five fiber packing arrangements considered, the hexagonal array appears to be the best suited for resisting combined axial-transverse tension.
